| SCIENTIFIC AND TECHNICAL | |
| Paton B.E., Ishchenko A.Ya. and Ustinov A.I. Application of nanotechnology of permanent joining of advanced light-weight metallic materials for aerospace engineering | 2 |
| The paper deals with the possibility of making solid-phase joints of advanced structural quasi-crystalline and intermetallic alloys, aluminium composites and nanomaterials by diffusion and friction stir welding using nanostructured fillers. It is shown that these welding processes allow producing permanent joints of difficult-to-weld materials applied in fabrication of aerospace products, parts of gas turbine engines, electrical engineering and heat exchanger units, in repair and restoration operations. | |
| Tsybulkin G.A. Stabilisation of electrode melting rate in robotic arc welding | 9 |
| One of the approaches to reduction of external disturbances affecting the electrode melting rate in robotic arc welding is considered. The procedure providing synthesis of the compensating circuit, based on the invariance principle, is described. Computer simulation results are presented. | |
| Kunkin D.D. System for TIG welding process control of low-thickness steels | 12 |
| The version of the pulsed-arc welding mode using a low-amperage welding current source with the PWM regulation and an experimental control system with application of microprocessor devices is presented. | |
| Khokhlova Yu.A., Chajka A.A. and Fedorchuk V.E. Mechanism of the effect of scandium on structure and mechanical properties of HAZ of the arc welded joints on aluminium alloy V96 | 14 |
| Heating of base metal in arc welding of high aluminium alloy V96 leads to melting of low-melting point (eutectic) phases along the grain boundaries in HAZ. These phases are the cause of hot cracking of HAZ, while after cooling they decrease the level of mechanical properties of the joints. Scandium additions to the alloy slow down recrystallisation processes, thus promoting formation of a dispersed structure of the eutectic precipitates along the grain boundaries and, consequently, improvement of mechanical properties of the joints. | |
| INDUSTRIAL | |
| Khaskin V.Yu. Laser-assisted hardening and coating processes (Review) | 18 |
| The paper considers the state-of-the-art in the field of heat hardening, alloying, cladding and coating processes, in which the main role is given to laser radiation. Flow diagrams of the above processes are presented, and their advantages and disadvantages are noted. Prospects for further development of these processes are analysed by examples of their practical application. | |
| Kovalchuk V.S. Determination of cyclic fatigue life of materials and welded joints at polyfrequency loading | 25 |
| Procedure and analytical dependences are proposed for calculation of cyclic fatigue life of materials, as well as welded joints at polyfrequency loading by the initial data, corresponding to the single-frequency loading. Conducted experimental verification of the derived dependences on large-scale samples, including welded samples, confirmed their validity in a broad range of variation of polyfrequency loading parameters, the spectrum of which consists of 3-7 components. | |
| Krivchikov S.Yu. Improvement of tribotechnical characteristics of hardfaced cast iron automobile crankshafts | 31 |
| Influence of heat treatment modes on tribotechnical characteristics of working mating arrangements of hardfaced crankshafts operating under conditions of metal against metal friction with lubrication was assessed. It is shown that tempering temperature influences quantitative ratio between pearlite and carbide-cementite phases in structure of the deposited metal and its wear resistance. | |
| BRIEF INFORMATION | |
| Pismenny A.S., Shvets V.I., Kuchuk-Yatsenko V.S. and Kislitsyn V.M. On issue of brazing metals using powder braze alloys of different dispersity | 34 |
| The paper presents results of investigations of copper and brass joints made using silver powder with less than 1 mm particle size as the braze alloy. Explanation is given of abnormally high formation rate of the seam melt of eutectic composition in brazing. Application of powders with higher degree of dispersity has good prospects for joining structural materials for which heating temperature is critical. | |
| Theses for a scientific degree | 36 |
| NEWS | |
| Technical workshop of welding specialists in Simferopol | 39 |
| Conference «Brazing-2008» in Toliatti | 41 |
| Developed at PWI | 8 |
| Index of articles for TPWJ 2008, Nos. 1-12 | 42 |
| List of authors | |
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